mp 406 crate

Seem to be having an oil issue with this engine.oil is getting into the exhaust port .plugs are a good colour and runs fine.im wondering if its the stem seals on the exhaust valve.mtr has only done 3000 miles.has rt magnum heads.and the cam has a 501/513lift.maybe something is beating on the seal
what type of seal should i use

anyone else have this engine and had issues

thanks terry